Measurement of nicotine, cotinine and trans-3'-hydroxycotinine in meconium by liquid chromatography-tandem mass spectrometry.
Summary of "Measurement of nicotine, cotinine and trans-3'-hydroxycotinine in meconium by liquid chromatography-tandem mass spectrometry."
Nicotine (NIC), cotinine (COT) and trans-3'-hydroxycotinine (OHCOT) are the most prevalent and abundant tobacco biomarkers in meconium. We have developed and validated an accurate and precise method for the measurement of these analytes in meconium in which potassium hydroxide is used to digest the meconium sample, followed by solid phase extraction from the liquified sample. The precision of OHCOT, COT and NIC measurements (intra-day and inter-day) were 4.8-10.6%, 3.4-11.6% and 9.3-15.8%, respectively. Evaluation of accuracy indicated bias of -4.0, 2.0 and 0.8% for OHCOT at concentrations of 0.5, 2.5 and 7.5ng/g. The accuracy estimates for COT at concentrations of 0.5, 2.5 and 7.5ng/g are 4.0, 4.0 and 5.7%, respectively. For NIC at 2, 10 and 30ng/g the accuracy was calculated to be 3.0, 5.0 and 5.1%, respectively. The linear range of standard solutions was 0.125-37.5ng/mL for OHCOT and COT, and 0.75-150ng/mL for NIC. This method was applied to the analysis of 374 meconium samples from infants of both smoking and nonsmoking mothers. Positive correlations with r(2)≥0.63 were observed between NIC and COT, COT and OHCOT, NIC and OHCOT, and NIC and (OHCOT+COT) in these samples.
Division of Laboratory Science, National Center for Environmental Health, Centers for Disease Control and Prevention, 4770 Buford Highway, NE, Atlanta, GA 30341, USA.
This article was published in the following journal.
Name: Journal of chromatography. B, Analytical technologies in the biomedical and life sciences
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21689995
- DOI: http://dx.doi.org/10.1016/j.jchromb.2011.05.054
Medical and Biotech [MESH] Definitions
The N-glucuronide conjugate of cotinine is a major urinary metabolite of NICOTINE. It thus serves as a biomarker of exposure to tobacco SMOKING. It has CNS stimulating properties.
Fractionation of a vaporized sample as a consequence of partition between a mobile gaseous phase and a stationary phase held in a column. Two types are gas-solid chromatography, where the fixed phase is a solid, and gas-liquid, in which the stationary phase is a nonvolatile liquid supported on an inert solid matrix.
A method of separation of two or more substances by repeated distribution between two immiscible liquid phases that move past each other in opposite directions. It is a form of liquid-liquid chromatography. (Stedman, 25th ed)
Chromatographic techniques in which the mobile phase is a liquid.
Meconium Aspiration Syndrome
A condition caused by inhalation of MECONIUM into the LUNG of FETUS or NEWBORN, usually due to vigorous respiratory movements during difficult PARTURITION or respiratory system abnormalities. Meconium aspirate may block small airways leading to difficulties in PULMONARY GAS EXCHANGE and ASPIRATION PNEUMONIA.
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